Numerical analysis of ballistic and shaped charge impact on metal targets.

Date

2023-5-30

Author

Göçmen, Yağmur

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This thesis presents a numerical study of the behavior of metal targets subjected to ballistic impact and shaped charge impact, utilizing finite element (FE) and smoothed particle hydrodynamics (SPH) methods. The study encompasses an in-depth analysis of different damage models and modeling techniques for various configurations, and the obtained results are validated using available experimental tests from the literature. Numerical modeling of ductile failure is simulated through the Johnson-Cook (JC) and modified Mohr-Coulomb (MMC) uncoupled damage models. Obtained results are validated using available experimental tests from the literature. In the first part of the study, the effects of impact angle, target plate thickness, and projectile nose shape on ballistic impact are investigated on aluminum alloy 2024-T351. The behavior of the target plate is compared using JC and MMC damage by utilizing FE and SPH methods. Then, material parameters for JC and MMC damage models of armor steel Armox 500T are calibrated using available experimental data from the literature and validated by tensile and ballistic impact test simulations. Furthermore, the ballistic performance of the Armox 500T steel target is discussed using these damage models with varying target thickness, impact angle, and projectile nose shape. Finally, a numerical analysis of shaped charge impact is conducted to investigate the jet formation process and its penetration performance on metal targets. This process is mainly used against heavily armored vehicles or in civil applications such as metal cutting and oil well completion. Conical and bowl-shaped liner geometries are simulated with various configurations to observe their effects on projectile shape and penetration capability is also studied. The ballistic performance of explosively formed projectiles (EFP) with different obliquity and target thicknesses are investigated and discussed by comparing FE and SPH methods. #45 and Armox 500T steels are used as the target materials, and the material behavior and failure mechanisms are modeled using the JC model. The results demonstrate that blunt projectiles, which are the most sensitive to parameter change and damage models. Moreover, FE outperforms the SPH method in predicting failure mechanisms; however, SPH can be useful for predicting residual velocity and hole diameter results. Furthermore, the performance of JC and MMC varies for different configurations.

Subject Keywords

Ballistic impact, Shaped charge impact, Ductile failure, FEM, SPH

URI

https://hdl.handle.net/11511/104419

Collections

Graduate School of Natural and Applied Sciences, Thesis